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Thread: What's causing calcium fluctuations

  1. Back To Top    #1

    Join Date
    Sep 2014
    Ponte Vedra, FL

    What's causing calcium fluctuations

    I ran my waterfall to aerate the water to bring TA from 110 down to 80 since my CYA was at 80. I kept ph at 7.0 to 7.2 to speed up the muriatic acid process of lowering TA. Boy, did my TA drop. The final number was 60 TA, calcium also drop to 240. Over the summer calcium went from 300 to mostly 400, then 420 about a week ago prior to aeration. From what I read, calcium is like CYA in that unless you're doing a water change, it shouldn't really change.

    I did add in 9 boxes of Borax with Muriatic per site's instructions but I don't think that should have any effect on CH, right?

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: What's causing calcium fluctuations

    Has to be testing error. Nothing you did should have lower the CH.
    Jason, TFP Moderator
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  3. Back To Top    #3

    Join Date
    Aug 2014
    Las Vegas, Nevada

    Re: What's causing calcium fluctuations

    I also don't understand this quote: "... I ran my waterfall to aerate the water to bring TA from 110 down to 80 ..."
    As I understand the Pool School, it's the acid that is supposed to lower the TA. All the aeration does is raise the PH back up.
    I can attest to the aeration raising PH, since I can add gallons of acid to my pool but the aeration from the spa spillover will raise my PH back up within a couple of hours. So quickly, in fact, that the acid doesn't even seem to have much effect on the TA.
    19,000 gal IG pool with Pebble-Tec, in-floor system, solar heat, waterfall, and spa with spillover
    Also SWG, variable-speed pump, cartridge filter, and water softener for feed line
    Water Testers: Taylor TF-100 and LaMotte 2056 ColorQ Pro 7

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